415.15% is the change from 66 to 340
Calculation steps:
[( 340 - 66 ) ÷ 66] x 100 = 415.15%
Formula
Percentage change = [(340 - 66) / 66] x 100
Subtract the new number by the original number
340 - 66 = 274
274 ÷ 66 = 4.151515151515151
4.151515151515151 x 100 = 415.15%